[time-nuts] Hi Power LED --- Thread Overload
SAIDJACK at aol.com
SAIDJACK at aol.com
Tue Sep 18 23:22:09 UTC 2012
Fellow Time Nuts,
in the last week we had more than 50 emails concerning Fedex versus UPS
shipping and how to package something, now we have a similar number of emails
about LED lighting.
I hope we can end this thread soon, or move it to another discussion group.
I for one am getting really tired of deleting 50+ emails every day that
are not related to time or frequency metrology.
Thanks,
Said
That is a very fun prank to do.
Show someone an o'scope with a flat line on it and hand them a pretzel or
carrot.
Tell them that you have implanted several sensors into their brain and you
want to calibrate them starting with mandibular vibration.
I have seriously freaked some people out with this one.
Dave
> -----Original Message-----
> From: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com] On Behalf Of gary
> Sent: Tuesday, September 18, 2012 12:28
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Hi Power LED Light power supply...
>
> There are ways for the flicker to be more evident. Don't laugh, but
> chewing something hard like a pretzel can bring out the flicker.
> Basically you can get beat patterns between the vibration of your eye
> and the light flicker.
>
> There is a common problem with DLP projectors that use color
> wheels. You
> will see reviewers shaking their heads and eat crunchy food
> in order to
> see "rainbows" on the screen.
>
> A similar problem occurs with matrixed LED displays mounted
> on machinery
> that has vibration. Very common in industrial controls since
> they like
> LEDs for readability.
>
> When I designed the 2nd generation LED display drivers, I bumped the
> refresh rate to 500Hz min. That was about 2x the frequency
> where I ran
> out of convoluted experiments to detect flicker.
>
> On an analog scope, you can display a flat line and have it wiggle by
> eating something crunchy. I don't have an analog scope on the
> bench at
> the moment, otherwise I would figure out the right
> circumstances to make
> that happen.
>
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